Radiator pressure cap



A Dec. 5, 1939. J. E. EsHBAUGl-l 2,181,969

RADIATOR PRESSURE CAP Gum/Magi l. h A

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Filed Dec. 17, 19156v Patented Dec'. 5, 1939 vUNITED STATES PATENTyoFF/ics 1 RADIATOR PRESSURE car Jesse E. Eshbaugh, Flint, Mich.,assignor to General Motors Corporation, Detroit, Mich., a corporation ofDelaware Application December 17, 1936, Serial No. 116,259

4 Claims.

I l nomical manufacture with regard to minimizing machine operations,reducing excess waste of material and promoting ease of assembly.

A further object of the invention is to provide a structure which in usewill be positive in action, free from complicated adjustments and careand resistant to breakdown and wear.

A preferred embodiment is illustrated in the accompanying drawingwherein Figure 1 shows in side elevation the front portion of an enginecylinder block, the cooling radiator and other parts which constitute apart of the liquid circulating system; Figure I2 is an enlarged verticalsectional view of the ller spout closure structure;,Figure 3 is anelevation of the iiller spout with the cap removed; Figure 4 is a topplan view of the cap and Figure 5 is a detail sectional view taken online 5-5 of Figure 4.

The cooling system illustrated in Figure 1 is conventional and involvesa radiator assembly I having suitable connection with a jacketedcylinder block 2 for the circulation of liquid. Associated with theinlet tank of the radiator is a filler spout 3 having an overflow orvent pipe 4 leading therefrom and on opposite sides of the vent a pairof spaced seats dened by the internal flange 5 at the bottom and theouttumed ange 6 at the top. Closing the system from the overflow andnested within the spout is a valve cage forming a unit with the closurecap 1. This cap is shown with a centrally depressed and apertured boss 8to which is secured by a hollow rivet 9 the central portion of ailexible diaphragm or spring disc I0 containing annular ribs orcorrugations to increase exibility, the free rim of which seats againstthe flange 6 to seal the outer end of the spout. Extending through thehollow rivet 9 is a solid stud or rivet II by which the valve cage isswivelly secured to the cap with a sealing Washer I2 therebetween.

The valve cage includes a cupped stamping I3,

the base of which has an oiset or annular shoulder I4 to locate a coilspring I5 within the cup.

At its opposite end the spring I5 acts against av domed plate I'I whosedome I8 projects upwardly inside the coils of the spring I6 and has inits vsure therebehind.

(Cl. 22o-44) top wall an opening dened by a dependent ange I9. In theannular groove provided by the side wall of the dome I8 and the ilangeI9 is a resilient washer or ring 26 held in place by an outturned lip atthe lower end of the ange I9. ,5 This ring 26 affords a seat for anannular rib pressed into the plate valve 2| for closing the opening. Theformation of the ribs affords on the underside of the plate 2| anannular groove for seating one end of\a coil spring 22 extend- 10 ingupwardly into the domed portion I8 of the plate I1. The other end of thecoil spring 22 is located by an upturned ange 23 on a stamped metalplate-24 which closes the open end of the valve cage and serves to holdthe parts in asseml5 bled relation. The plate 24 is centrally aperturedand beyond the openings therein is formed with a raised annular ridge 25which provides a seat for; a sealing ring 26 carried by the plate I'I.Downwardly projected and inwardly inclined 20 members 21 integral withthe outer edge of the plate and consisting of eitheran annular ange or aseries of dependent tongues extend beside the outside margin of the ring26 while a iianged sleeve 28 press tted or otherwise secured in- 25teriorly of the dome I8 passes through the central opening in the ringto engage and hold the inner edge against displacement and incidentallyserves also as a seal to prevent the ring being blown away from theplate by the action of pres- 30 The dependent ange 2'I strengthens theplate I'I and is inclined inwardly to avoid its being caught on the cagein which the plate iioats. A slight clearance between it andthe edge ofthe gasket 26 is desirable to 35 allow room for gasket swell in service.For the same reason clearance should `be provided between the peripheryof the gasket 20 and the dome I8.

As will be understood, the plate I1 and the -40 gasket rings 20 and 26area subassembly unit and the cagev enclosed parts designed forcompactness, are assembled through the open end of the cup I3 insuccession, the spring I5, the subassembled plate I1, the plate 2l andthe spring 45 22 being introduced and thereafter the cover 24 beingapplied by having its rim rolled or peened over as at 29 about theoutturned rim 30 at the bottom of'the cupped casing I3. In theapplication of the cover 24 both valve springs are com- 50 pressed andtheir action in seating the respective valves is in opposite directions.

It may be here pointed out that the gasket rings 20 and 26 and the cageseating gasket 3l positioned on the internal ange E by one or 55 moreindentations 32, for convenience and economy of manufacture, may be allcut by a single operation from the same piece of rubber or othersuitable sealing material. To this end the dimensions of the parts aresuch that the outside diameter of the ring 26 substantially correspondswith the inside diameter of the ring 3| and its inside diametersubstantially corresponds with the outside diameter of the ring 20.

One or more ports 33 in the cup I3 communicates the interior, of thevalve cage with the spout so that the system is vented through the pipe4, whenever internal system pressure exceeds the force of the spring Iand lifts the domed plate l1 or Whenever internal system pressure isbelow atmospheric pressure and causes the valve 2| to open against itsspring 22, until balance is established.

A seal between the spout and the cage is effected by seating the rim ofthe closure plate 24 on the gasket 3|. In order to avoid scoring orscrubbing wear between these parts the edge 29 may be peened or rolledover loosely at a number of points for a free swivel connection.Aiternately the whole of the cage may be swivelly joined to therotatable cap through the rivet Il as previously described. In eitherevent rotation ofthe cap for its application to or removal from thespout may occur without relative rotation of the cage and sealing gasket3l.

To save time and avoid the tedious and slow rotation of the removablecap through, several turns it is proposed to avoid a screw threadedconnection between the spout and cap and use a simple bayonet type ofconnection. For this purpose the cap 1 is provided at the lower edge ofits skirt and at diametrically opposite points with inturned ears 34 forpassage through openings 35 in the top ange 6 of the spout andengagement with camming surfaces on the lower edge of the'downturned rim36 of the flange. v'Ihe two camming surfaces are identical in profileand as seen in Figure 3 each extends from the entrance opening 35 to astop 31 defining the final position for the inturned locking ear 34. Asthe ear ridesy down the cam upon cap rotation the whole assembly movesinto the spout causing the cage to seat on the gasket 3l and the springdia phragm I0 to seat on the flange 6. Intermediate stop to removal ofthe cap acts as a warningl against sudden removal and the liability ofinjury should internal pressures exist. With the ear 34 engaged with thestop 38 the relation of the parts is such that the cage is lifted fromthe gasket 3| for venting the system and allowing excess pressure toescape through the overflow pipe 4. reduction in internal pressure thecap may be depressed so that the ear 34 clears the stop 38 forfurthermovement up the inclined ramp to the opening 35.

To give an additional warning of the presence of internal pressure atongue 39 is struck down out of the region of each of the radialprojections or handles 40 in the cap and is provided with After asuitable delay to allow a an inturned end 4l to engage with theunderside of the spring disc I0 at its periphery and thereby lift orunseat the disc from the ange 6 when the cap is turned to the safetyposition afforded by engagement of the ear 34 with the stop shoulder 38.Thus the end 4I limits distention of the disc I 0 yaway from the cap 1but full advantage of spring pressure is had to maintain a seal at thetop of the spout whenA the parts are in final interlocked position. Bypositively break-i ing the upper seal asillustrated in Figure 5, thespout not only vents through the overflow 4 but also under the cap to aslight extent and the resultant hiss or visual indication of escapingpressure fluid may be observed and precaution taken to delay completeremoval for the short interval necessary for the full relief ofpressure.

1. In a valved sealing closure for a filler spout, a cap adapted fordetachable spout engagement, an inverted cup secured on the underside ofthe cap, a valve seating member secured over the open end of the cup, anoutwardly opening valve seated on said member and provided with acentral dome portion, a valve seating spring telescopically fitted tosaid dome portion and seating at opposite ends on the cap and valve, aninwardly opening valve housed and guided by said dome portion and seatedover an opening in the end wall thereof and a seating spring interposedbetween and bearing at opposite ends on said inwardly opening 'valve andsaid valve seating member.

2. In a pressure cooling system, a valve cage assembly comprising acupped casing, a valve seating spring enclosed within the casing inbearing engagement with the base of the casing, an outwardly openingvalve acting against said spring and having a centralidome nested withinthe spring, an inwardly opening valve seated against the top of the domeover an opening therein, a spring seating the inwardly opening valve andhoused within said dome, a closure plate for the open end of the casingto retain the valves and springs therein, a seating formation on theplate to seat the first mentioned valve and a seating formation on theplate to seat the lastrmentioned spring.

3. In a pressure cooling system, a valvecage, a sealing ring thereinforming a part of an outwardly opening valve, a domed backing plate forthe ring having a dependent peripheral ange in locating engagement withthe rim of the ring, a central retainer sleeve for the ring projectedthrough the ring and carried by the plate, a dependent flange in the topwall of the dome dening an opening through the plate and terminating inan .outturned lip, and a sealing ring surrounding said flange and beingretained by said lip to provide a valve seat around the opening.

4. A filler spout and closure assembly, including a filler spout havinga pair of spaced seats, a valve cage engaging one of said seats, aflexible diaphragm engaging the other seat, a detachable ca'p rotatablyengaged with the spout, a hollow rivet securely fastening together thecap and flexible diaphragm, and a fastening element passing looselythrough said hollow rivet and swivelly joining the valve cage to thecap.

JESSE E. ESI-IBAUGH.

